21409619

素因数分解:

$7^2\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{157}}^1$

素因数の和:216

約数の個数: 36

約数和(自身を含む): 28747152

約数和(自身を除く): 7337533

約数列:

[1, 7, 11, 23, 49, 77, 121, 157, 161, 253, 539, 847, 1099, 1127, 1727, 1771, 2783, 3611, 5929, 7693, 12089, 12397, 18997, 19481, 25277, 39721, 84623, 132979, 136367, 176939, 278047, 436931, 930853, 1946329, 3058517, 21409619]

約数ペア:

[(1, 21409619), (7, 3058517), (11, 1946329), (23, 930853), (49, 436931), (77, 278047), (121, 176939), (157, 136367), (161, 132979), (253, 84623), (539, 39721), (847, 25277), (1099, 19481), (1127, 18997), (1727, 12397), (1771, 12089), (2783, 7693), (3611, 5929)]